I think they have hit a perfect balance with the mobs. When I see a lone mob, I know I won't have any trouble. But when I see others wandering nearby, or if I see a group, then I'm more inclined to sneak around them or avoid them entirely. It's nice actually having to show discretion when fighting in the overworld again, and especially in Temple Leves, as some pit you against groups of enemies unless you're careful about how you fight them.